LX1681 Microsemi Corporation, LX1681 Datasheet - Page 2

• Manufacturer Part Number: LX1681
• Description: VOLTAGE - MODE PWM CONTROLLERS
• Manufacturer: Microsemi Corporation

LX1681/1682
2
(Unless otherwise specified, 4.75V < V
Reference
Reference Voltage
Oscillator
Frequency
Ramp Amplitude
Error Amplifier
Input Resistance
Current Sense
Current Set
V
Current Sense Delayed
Output Drivers
Drive Rise Time, Fall Time
Drive High
Drive Low
UVLO and Soft-Start (SS)
V
Hysteresis
SS Resistor
SS Output Enable
Hiccup Duty Cycle
Supply Current
V
Static Supply Current
TRIP
CC5
CC12
Supply Voltage (V
Supply Voltage (V
Output Drive Peak Current Source (500ns) ....................................................... 1.0A
Output Drive Peak Current Sink (500ns) ........................................................... 1.0A
Input Voltage (SS/ENABLE Pin) ............................................................. -0.3V to 6V
Operating Junction Temperature .................................................................... 150°C
Storage Temperature Range ........................................................... -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) .................................................... 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with
DM PACKAGE:
Junction Temperature Calculation: T
The
system. All of the above assume no ambient airflow.
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Start-Up Threshold
Dynamic Supply Current
JA
numbers are guidelines for the thermal performance of the device/pc-board
respect to Ground. Currents are positive into, negative out of the specified
terminal.
Parameter
ABSOLUTE MAXIMUM RATINGS
C1
CC
) ............................................................................................ 18V
) .............................................................................................. 7V
12V
5V
THERMAL DATA
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
CC
J
= T
< 5.25V and 10.8V < V
Symbol
V
V
DC
A
F
T
V
V
R
V
I
I
V
RAMP
R
I
T
V
I
OSC
SET
VC1
VCC
CSD
CD
O L T A G E
+ (P
DH
EN
FB
IN
RF
DL
ST
SS
HIC
P
E L E C T R I C A L C H A R A C T E R I S T I C S
D
R O D U C T I O N
x
V
V
V
V
Reference to V
C
I
I
V
C
Out Freq = 200kHz, C
V
V
SOURCE
SINK
OUT
OUT
OUT
CS
C1
SS
SS
L
SS
= 3000pF
JA
JA
= V
> 4.0V
= 0.1µF, F
< 0.3V
< 0.3V
= 20mA, V
).
= V
= V
= V
- M
= 20mA, V
CC
FB
FB
FB
- 0.4V
, T
, 0°C
O D E
C1
A
REQ
= 25°C
< 13.2V, 0°C
C1
CC
Test Conditions
= 12V
C1
= 100Hz
T
A
(Note 1)
= 12V
P W M C
70°C
L
= 3000pF, Synch., V
D
165°C/W
A T A
T
A
O N T R O L L E R S
70°C. Test conditions: V
S
H E E T
SS
> 0.3V
GND / BDRV*
N.C. / GND*
* Pin 3 = N.C. for LX1681, GND for LX1682
CC
Pin 4 = GND for LX1681, BDRV for LX1682
PACKAGE PIN OUTS
= 5V, V
1.237
1.231
-460
0.25
Min.
170
4.0
V
40
10
SS
FB
DM PACKAGE
LX1681/1682
C1
(Top View)
= 12V, T = 25°C.)
1
2
3
4
Typ.
1.25
1.25
-400
4.25
0.10
190
1.1
0.1
0.3
20
45
50
11
20
10
24
10
5
8
7
6
5
1.262
1.269
-340
Max.
0.35
V
CS
V
TDRV
230
0.2
4.5
28
12
CC
C1
7
Copyright © 1999
Rev. 1.0 5/99
Units
µsec
kHz
mA
mA
mA
k
mV
k
V
µA
ns
%
V
V
V
V
V
V
V
PP